fs/GzipOutputStream: new class wrapping zlib

test/run_gzip.cxx

@@ -0,0 +1,79 @@
+/*
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "config.h"
+#include "fs/output/GzipOutputStream.hxx"
+#include "fs/output/StdioOutputStream.hxx"
+#include "util/Error.hxx"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+static bool
+Copy(OutputStream &dest, int src, Error &error)
+{
+	while (true) {
+		char buffer[4096];
+		ssize_t nbytes = read(src, buffer, sizeof(buffer));
+		if (nbytes <= 0) {
+			if (nbytes < 0) {
+				error.SetErrno();
+				return false;
+			} else
+				return true;
+		}
+
+		if (!dest.Write(buffer, nbytes, error))
+			return false;
+	}
+}
+
+static bool
+CopyGzip(OutputStream &_dest, int src, Error &error)
+{
+	GzipOutputStream dest(_dest, error);
+	return dest.IsDefined() &&
+		Copy(dest, src, error) &&
+		dest.Flush(error);
+}
+
+static bool
+CopyGzip(FILE *_dest, int src, Error &error)
+{
+	StdioOutputStream dest(_dest);
+	return CopyGzip(dest, src, error);
+}
+
+int
+main(int argc, gcc_unused char **argv)
+{
+	if (argc != 1) {
+		fprintf(stderr, "Usage: run_gzip\n");
+		return EXIT_FAILURE;
+	}
+
+	Error error;
+	if (!CopyGzip(stdout, STDIN_FILENO, error)) {
+		fprintf(stderr, "%s\n", error.GetMessage());
+		return EXIT_FAILURE;
+	}
+
+	return EXIT_SUCCESS;
+}